Duo-prop propeller



FIG. 1 is a perspective view of a duo-prop propeller, showing my new design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a right side elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Reference to front, rear, right, left, top, bottom, are merely to indicate how the views relate to one another, and do not indicate how the propeller would be positioned when used. 

CLAIM I claim the ornamental design for a duo-prop propeller, as shown and described. 